ETE Quitandinha Petrópolis - Wastewater Treatment Plant in Petrópolis, Rio de Janeiro

ETE Quitandinha Petrópolis is a municipal wastewater treatment plant located in the Valparaíso neighborhood of Petrópolis, in the state of Rio de Janeiro, Brazil. The plant serves an estimated population of 91,949, placing it in the medium-to-large agglomeration category for Brazilian wastewater infrastructure. It is situated in the mountainous Serra dos Órgãos region, which influences local hydrology and treatment requirements. Brazil's wastewater treatment framework is governed by federal laws such as the National Water Resources Policy (Law 9.433/1997) and CONAMA resolutions, which set discharge standards for organic matter and pathogens. For plants of this scale, secondary treatment is typically expected to meet effluent quality standards. The plant's designed capacity is reported as 1. The treated effluent from ETE Quitandinha is discharged into local watercourses that eventually drain into the Piabanha River, a tributary of the Paraíba do Sul River. The Paraíba do Sul basin is a critical water source for southeastern Brazil, supplying drinking water to millions and supporting diverse aquatic ecosystems. Downstream, the river flows into the Atlantic Ocean near Campos dos Goytacazes, making the plant's performance important for both local and regional water quality.

The plant's discharge enters the Piabanha River, which flows into the Paraíba do Sul River, one of Brazil's most important water bodies. The Paraíba do Sul basin supports a rich diversity of fish species and provides water for agriculture, industry, and drinking water for the Rio de Janeiro metropolitan area. The mountainous terrain of Petrópolis can lead to rapid runoff and erosion, making proper treatment essential to prevent sediment and nutrient pollution downstream.